| Price | $2 |
|---|---|
| Category | Communication Modules |
| Availability | In stock |
| Delivery | Shipped across Lebanon, or collect from the lab |
The small board that solders onto the back of a 1602 or 2004 character LCD and turns its sixteen parallel pins into two I2C wires. A PCF8574 expander does the work; the blue trimmer sets contrast and a jumper switches the backlight. You wire four pins - VCC, GND, SDA, SCL - instead of a dozen, and drive it with the LiquidCrystal_I2C library. Most of these answer at address 0x27; boards fitted with the PCF8574A variant answer at 0x3F.
Key features
- Turns a 16-pin character LCD into four wires
- PCF8574 I2C expander, 2.5-6V, normally run at 5V
- I2C address 0x27, or 0x3F on PCF8574A boards
- Three solder pads (A0-A2) shift the address for several LCDs
- 10k contrast trimmer and backlight jumper on board
- Fits standard HD44780 1602 and 2004 modules
Details
Specifications
| Chipset | PCF8574 8-bit I2C I/O expander |
|---|---|
| Interface | I2C (SDA, SCL), 100 kHz |
| I2C address | 0x27 typical; 0x3F with a PCF8574A; A0-A2 pads change it |
| Operating voltage | 2.5-6V (5V in normal use) |
| Supply current | ~40 uA typ. operating, 10 uA max standby |
| Fits | HD44780-compatible 1602 and 2004 character LCDs |
| Adjustments | Contrast trimmer (10k) and backlight jumper |
| Connections | 16-pin LCD header plus 4-pin GND / VCC / SDA / SCL |
